3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo "Hello " . world . "!"; ?>
based on kl9N4
Output for 7.2.0
Warning: Use of undefined constant world - assumed 'world' (this will throw an Error in a future version of PHP) in /in/9aQgd on line 2 Hello world!
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant world - assumed 'world' in /in/9aQgd on line 2 Hello world!